添加项目文件。

Comic_Compressor.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.11.35219.272
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Comic_Compressor", "Comic_Compressor\Comic_Compressor.csproj", "{B6B0E3D8-DE3D-4A7D-AAE5-34953ABFEA2A}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Debug|x64 = Debug|x64
+		Release|Any CPU = Release|Any CPU
+		Release|x64 = Release|x64
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{B6B0E3D8-DE3D-4A7D-AAE5-34953ABFEA2A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B6B0E3D8-DE3D-4A7D-AAE5-34953ABFEA2A}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B6B0E3D8-DE3D-4A7D-AAE5-34953ABFEA2A}.Debug|x64.ActiveCfg = Debug|x64
+		{B6B0E3D8-DE3D-4A7D-AAE5-34953ABFEA2A}.Debug|x64.Build.0 = Debug|x64
+		{B6B0E3D8-DE3D-4A7D-AAE5-34953ABFEA2A}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B6B0E3D8-DE3D-4A7D-AAE5-34953ABFEA2A}.Release|Any CPU.Build.0 = Release|Any CPU
+		{B6B0E3D8-DE3D-4A7D-AAE5-34953ABFEA2A}.Release|x64.ActiveCfg = Release|x64
+		{B6B0E3D8-DE3D-4A7D-AAE5-34953ABFEA2A}.Release|x64.Build.0 = Release|x64
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {FA1DD3CC-0702-404F-9D7F-40EB2736F8AD}
+	EndGlobalSection
+EndGlobal

Comic_Compressor/AvifCompressor.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Comic_Compressor
+{
+    internal class AvifCompressor
+    {
+        internal static void CompressImages(string sourceImagePath, string targetStoragePath)
+        {
+            //尚未实现
+            throw new NotImplementedException();
+        }
+    }
+}

Comic_Compressor/Comic_Compressor.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0-windows</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <Platforms>AnyCPU;x64</Platforms>
+    <UseWindowsForms>True</UseWindowsForms>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="LibHeifSharp" Version="3.2.0" />
+    <PackageReference Include="SixLabors.ImageSharp" Version="3.1.5" />
+  </ItemGroup>
+
+</Project>

Comic_Compressor/Program.cs

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+using System.Text;
+using System.Windows.Forms;
+namespace Comic_Compressor
+{
+    internal class Program
+    {
+        [STAThread]
+        static void Main()
+        {
+            Console.OutputEncoding = Encoding.UTF8;
+
+            Console.WriteLine("请选择源图像所在位置：");
+            string? sourceImagePath = GetFolderPath();
+            if (string.IsNullOrEmpty(sourceImagePath))
+            {
+                Console.WriteLine("未选择文件夹，程序将退出。");
+                return;
+            }
+
+            Console.WriteLine("请输入目标存储位置：");
+            string? targetStoragePath = GetFolderPath();
+            if (string.IsNullOrEmpty(targetStoragePath))
+            {
+                Console.WriteLine("未选择文件夹，程序将退出。");
+                return;
+            }
+
+            Console.WriteLine("请选择压缩模式：0 - 压缩成webp，1 - 压缩成avif");
+            string? modeInput = Console.ReadLine();
+            if (modeInput == null)
+            {
+                Console.WriteLine("无效输入");
+                return;
+            }
+
+            switch (modeInput)
+            {
+                case "0":
+                    WebpCompressor.CompressImages(sourceImagePath, targetStoragePath);
+                    break;
+                case "1":
+                    AvifCompressor.CompressImages(sourceImagePath, targetStoragePath);
+                    break;
+                default:
+                    Console.WriteLine("不支持的模式");
+                    break;
+            }
+        }
+
+        private static string? GetFolderPath()
+        {
+            using var dialog = new FolderBrowserDialog();
+            dialog.ShowNewFolderButton = false;
+
+            DialogResult result = dialog.ShowDialog();
+
+            if (result == DialogResult.OK && !string.IsNullOrWhiteSpace(dialog.SelectedPath))
+            {
+                return dialog.SelectedPath;
+            }
+            else
+            {
+                return null;
+            }
+        }
+    }
+}

Comic_Compressor/WebpCompressor.cs

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+using SixLabors.ImageSharp;
+using SixLabors.ImageSharp.Formats.Webp;
+using SixLabors.ImageSharp.Processing;
+
+namespace Comic_Compressor
+{
+    internal class WebpCompressor
+    {
+        internal static void CompressImages(string sourceImagePath, string targetStoragePath)
+        {
+            // Step 1: Get all subdirectories and store them in a list
+            List<string> subdirectories = new(Directory.GetDirectories(sourceImagePath, "*", SearchOption.AllDirectories));
+
+            // Step 2: Iterate through each subdirectory in order
+            foreach (string subdirectory in subdirectories)
+            {
+                // Step 3: Process each directory
+                ProcessDirectory(subdirectory, sourceImagePath, targetStoragePath);
+            }
+        }
+
+        private static void ProcessDirectory(string subdirectory, string sourceImagePath, string targetStoragePath)
+        {
+            // Get the relative path of the subdirectory
+            string relativePath = Path.GetRelativePath(sourceImagePath, subdirectory);
+
+            // Create the corresponding subdirectory in the target storage path
+            string targetSubdirectory = Path.Combine(targetStoragePath, relativePath);
+            Directory.CreateDirectory(targetSubdirectory);
+
+            // Get all image files in the subdirectory (jpg and png)
+            string[] imageFiles = GetImageFiles(subdirectory);
+
+            // Iterate through each image file
+            foreach (string imageFile in imageFiles)
+            {
+                // Set the target file path with the .webp extension
+                string targetFilePath = Path.Combine(targetSubdirectory, Path.GetFileNameWithoutExtension(imageFile) + ".webp");
+                CompressImage(imageFile, targetFilePath);
+            }
+
+            Console.WriteLine($"{Path.GetFileName(subdirectory)} processed successfully.");
+        }
+
+        private static string[] GetImageFiles(string directoryPath)
+        {
+            // Get all image files supported by ImageSharp
+            string[] supportedExtensions = ["*.jpg", "*.jpeg", "*.png", "*.bmp", "*.gif", "*.tiff"];
+            List<string> allFiles = [];
+
+            foreach (string extension in supportedExtensions)
+            {
+                allFiles.AddRange(Directory.GetFiles(directoryPath, extension, SearchOption.TopDirectoryOnly));
+            }
+
+            return [.. allFiles];
+        }
+
+        private static void CompressImage(string sourceFilePath, string targetFilePath)
+        {
+            using SixLabors.ImageSharp.Image image = SixLabors.ImageSharp.Image.Load(sourceFilePath);
+            // Check the longest side of the image and resize if necessary
+            int maxDimension = Math.Max(image.Width, image.Height);
+            if (maxDimension > 1200)
+            {
+                double scaleFactor = 1200.0 / maxDimension;
+                int newWidth = (int)(image.Width * scaleFactor);
+                int newHeight = (int)(image.Height * scaleFactor);
+                image.Mutate(x => x.Resize(newWidth, newHeight));
+            }
+
+            // Save the image as WebP with a quality level of 70 (for lossy compression)
+            var encoder = new WebpEncoder
+            {
+                Quality = 70,
+                FileFormat = WebpFileFormatType.Lossy
+            };
+
+            image.Save(targetFilePath, encoder);
+        }
+    }
+}